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terraform-aws-eks/docs/UPGRADE-20.0.md

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Upgrade from v19.x to v20.x

Please consult the examples directory for reference example configurations. If you find a bug, please open an issue with supporting configuration to reproduce.

List of backwards incompatible changes

  • Minium supported AWS provider version increased to v5.34
  • Minimum supported Terraform version increased to v1.3 to support Terraform state moved blocks as well as other advanced features
  • The resolve_conflicts argument within the cluster_addons configuration has been replaced with resolve_conflicts_on_create and resolve_conflicts_on_update now that resolve_conflicts is deprecated
  • The default/fallback value for the preserve argument of cluster_addonsis now set to true. This has shown to be useful for users deprovisioning clusters while avoiding the situation where the CNI is deleted too early and causes resources to be left orphaned resulting in conflicts.
  • The Karpenter sub-module's use of the irsa naming convention has been removed, along with an update to the Karpenter controller IAM policy to align with Karpenter's v1beta1/v0.32 changes. Instead of referring to the role as irsa or pod_identity, its simply just an IAM role used by the Karpenter controller and there is support for use with either IRSA and/or Pod Identity (default) at this time
  • The aws-auth ConfigMap resources have been moved to a standalone sub-module. This removes the Kubernetes provider requirement from the main module and allows for the aws-auth ConfigMap to be managed independently of the main module. This sub-module will be removed entirely in the next major release.
  • Support for cluster access management has been added with the default authentication mode set as API_AND_CONFIG_MAP. Support for CONFIG_MAP is no longer supported; instead you will need to use API_AND_CONFIG_MAP at minimum
  • Karpenter EventBridge rule key spot_interrupt updated to correct mis-spelling (was spot_interupt). This will cause the rule to be replaced

⚠️ Upcoming Changes Planned in v21.0 ⚠️

To give users advanced notice and provide some future direction for this module, these are the following changes we will be looking to make in the next major release of this module:

  1. The aws-auth sub-module will be removed entirely from the project. Since this sub-module is captured in the v20.x releases, users can continue using it even after the module moves forward with the next major version. The long term strategy and direction is cluster access entry and to rely only on the AWS Terraform provider.
  2. The default value for authentication_mode will change to API. Aligning with point 1 above, this is a one way change, but users are free to specify the value of their choosing in place of this default (when the change is made). This module will proceed with an EKS API first strategy.
  3. The launch template and autoscaling group usage contained within the EKS managed node group and self-managed node group sub-modules *might be replaced with the terraform-aws-autoscaling module. At minimum, it makes sense to replace most of functionality in the self-managed node group module with this external module, but its not yet clear if there is any benefit of using it in the EKS managed node group sub-module. The interface that users interact with will stay the same, the changes will be internal to the implementation and we will do everything we can to keep the disruption to a minimum.
  4. The platform variable will be replaced and instead ami_type will become the standard across both self-managed node group(s) and EKS managed node group(s). As EKS expands its portfolio of supported operating systems, the ami_type is better suited to associate the correct user data format to the respective OS. The platform variable is a legacy artifact of self-managed node groups but not as descriptive as the ami_type, and therefore it will be removed in favor of ami_type.

Additional changes

Added

  • A module tag has been added to the cluster control plane
  • Support for cluster access entries. The bootstrap_cluster_creator_admin_permissions setting on the control plane has been hardcoded to false since this operation is a one time operation only at cluster creation per the EKS API. Instead, users can enable/disable enable_cluster_creator_admin_permissions at any time to achieve the same functionality. This takes the identity that Terraform is using to make API calls and maps it into a cluster admin via an access entry. For users on existing clusters, you will need to remove the default cluster administrator that was created by EKS prior to the cluster access entry APIs - see the section Removing the default cluster administrator for more details.
  • Support for specifying the CloudWatch log group class (standard or infrequent access)
  • Native support for Windows based managed node groups similar to AL2 and Bottlerocket
  • Self-managed node groups now support instance_maintenance_policy and have added max_healthy_percentage, scale_in_protected_instances, and standby_instances arguments to the instance_refresh.preferences block

Modified

  • For sts:AssumeRole permissions by services, the use of dynamically looking up the DNS suffix has been replaced with the static value of amazonaws.com. This does not appear to change by partition and instead requires users to set this manually for non-commercial regions.
  • The default value for kms_key_enable_default_policy has changed from false to true to align with the default behavior of the aws_kms_key resource
  • The Karpenter default value for create_instance_profile has changed from true to false to align with the changes in Karpenter v0.32
  • The Karpenter variable create_instance_profile default value has changed from true to false. Starting with Karpenter v0.32.0, Karpenter accepts an IAM role and creates the EC2 instance profile used by the nodes

Removed

  • The complete example has been removed due to its redundancy with the other examples
  • References to the IRSA sub-module in the IAM repository have been removed. Once https://github.com/clowdhaus/terraform-aws-eks-pod-identity has been updated and moved into the organization, the documentation here will be updated to mention the new module.

Variable and output changes

  1. Removed variables:

    • cluster_iam_role_dns_suffix - replaced with a static string of amazonaws.com

    • manage_aws_auth_configmap

    • create_aws_auth_configmap

    • aws_auth_node_iam_role_arns_non_windows

    • aws_auth_node_iam_role_arns_windows

    • aws_auth_fargate_profile_pod_execution_role_arn

    • aws_auth_roles

    • aws_auth_users

    • aws_auth_accounts

    • Karpenter

      • irsa_tag_key
      • irsa_tag_values
      • irsa_subnet_account_id
      • enable_karpenter_instance_profile_creation

  2. Renamed variables:

    • Karpenter
      • create_irsa -> create_iam_role
      • irsa_name -> iam_role_name
      • irsa_use_name_prefix -> iam_role_name_prefix
      • irsa_path -> iam_role_path
      • irsa_description -> iam_role_description
      • irsa_max_session_duration -> iam_role_max_session_duration
      • irsa_permissions_boundary_arn -> iam_role_permissions_boundary_arn
      • irsa_tags -> iam_role_tags
      • policies -> iam_role_policies
      • irsa_policy_name -> iam_policy_name
      • irsa_ssm_parameter_arns -> ami_id_ssm_parameter_arns
      • create_iam_role -> create_node_iam_role
      • iam_role_additional_policies -> node_iam_role_additional_policies
      • policies -> iam_role_policies
      • iam_role_arn -> node_iam_role_arn
      • iam_role_name -> node_iam_role_name
      • iam_role_name_prefix -> node_iam_role_name_prefix
      • iam_role_path -> node_iam_role_path
      • iam_role_description -> node_iam_role_description
      • iam_role_max_session_duration -> node_iam_role_max_session_duration
      • iam_role_permissions_boundary_arn -> node_iam_role_permissions_boundary_arn
      • iam_role_attach_cni_policy -> node_iam_role_attach_cni_policy
      • iam_role_additional_policies -> node_iam_role_additional_policies
      • iam_role_tags -> node_iam_role_tags

  3. Added variables:

    • create_access_entry

    • enable_cluster_creator_admin_permissions

    • authentication_mode

    • access_entries

    • cloudwatch_log_group_class

    • Karpenter

      • iam_policy_name
      • iam_policy_use_name_prefix
      • iam_policy_description
      • iam_policy_path
      • enable_irsa
      • create_access_entry
      • access_entry_type

    • Self-managed node group

      • instance_maintenance_policy
      • create_access_entry
      • iam_role_arn

  4. Removed outputs:

    • aws_auth_configmap_yaml

  5. Renamed outputs:

    • Karpenter
      • irsa_name -> iam_role_name
      • irsa_arn -> iam_role_arn
      • irsa_unique_id -> iam_role_unique_id
      • role_name -> node_iam_role_name
      • role_arn -> node_iam_role_arn
      • role_unique_id -> node_iam_role_unique_id

  6. Added outputs:

    • access_entries

    • Karpenter

      • node_access_entry_arn

    • Self-managed node group

      • access_entry_arn

Upgrade Migrations

Diff of Before (v19.21) vs After (v20.0)

 module "eks" {
   source  = "terraform-aws-modules/eks/aws"
-  version = "~> 19.21"
+  version = "~> 20.0"

# If you want to maintain the current default behavior of v19.x
+  kms_key_enable_default_policy = false

-   manage_aws_auth_configmap = true

-   aws_auth_roles = [
-     {
-       rolearn  = "arn:aws:iam::66666666666:role/role1"
-       username = "role1"
-       groups   = ["custom-role-group"]
-     },
-   ]

-   aws_auth_users = [
-     {
-       userarn  = "arn:aws:iam::66666666666:user/user1"
-       username = "user1"
-       groups   = ["custom-users-group"]
-     },
-   ]
}

+ module "eks_aws_auth" {
+   source  = "terraform-aws-modules/eks/aws//modules/aws-auth"
+   version = "~> 20.0"

+   manage_aws_auth_configmap = true

+   aws_auth_roles = [
+     {
+       rolearn  = "arn:aws:iam::66666666666:role/role1"
+       username = "role1"
+       groups   = ["custom-role-group"]
+     },
+   ]

+   aws_auth_users = [
+     {
+       userarn  = "arn:aws:iam::66666666666:user/user1"
+       username = "user1"
+       groups   = ["custom-users-group"]
+     },
+   ]
+ }

Karpenter Diff of Before (v19.21) vs After (v20.0)

 module "eks_karpenter" {
   source  = "terraform-aws-modules/eks/aws//modules/karpenter"
-  version = "~> 19.21"
+  version = "~> 20.0"

# If you wish to maintain the current default behavior of v19.x
+  enable_irsa             = true
+  create_instance_profile = true

# To avoid any resource re-creation
+  iam_role_name          = "KarpenterIRSA-${module.eks.cluster_name}"
+  iam_role_description   = "Karpenter IAM role for service account"
+  iam_policy_name        = "KarpenterIRSA-${module.eks.cluster_name}"
+  iam_policy_description = "Karpenter IAM role for service account"
}

Terraform State Moves

⚠️ Authentication Mode Changes ⚠️

Changing the authentication_mode is a one-way decision. See announcement blog for further details:

Switching authentication modes on an existing cluster is a one-way operation. You can switch from CONFIG_MAP to API_AND_CONFIG_MAP. You can then switch from API_AND_CONFIG_MAP to API. You cannot revert these operations in the opposite direction. Meaning you cannot switch back to CONFIG_MAP or API_AND_CONFIG_MAP from API.

Important

If migrating to cluster access entries and you will NOT have any entries that remain in the aws-auth ConfigMap, you do not need to remove the configmap from the statefile. You can simply follow the migration guide and once access entries have been created, you can let Terraform remove/delete the aws-auth ConfigMap.

If you WILL have entries that remain in the aws-auth ConfigMap, then you will need to remove the ConfigMap resources from the statefile to avoid any disruptions. When you add the new aws-auth sub-module and apply the changes, the sub-module will upsert the ConfigMap on the cluster. Provided the necessary entries are defined in that sub-module's definition, it will "re-adopt" the ConfigMap under Terraform's control.

authentication_mode = "API_AND_CONFIG_MAP"

When using authentication_mode = "API_AND_CONFIG_MAP" and there are entries that will remain in the configmap (entries that cannot be replaced by cluster access entry), you will first need to update the authentication_mode on the cluster to "API_AND_CONFIG_MAP". To help make this upgrade process easier, a copy of the changes defined in the v20.0.0 PR have been captured here but with the aws-auth components still provided in the module. This means you get the equivalent of the v20.0.0 module, but it still includes support for the aws-auth configmap. You can follow the provided README on that interim migration module for the order of execution and return here once the authentication_mode has been updated to "API_AND_CONFIG_MAP". Note - EKS automatically adds access entries for the roles used by EKS managed node groups and Fargate profiles; users do not need to do anything additional for these roles.

Once the authentication_mode has been updated, next you will need to remove the configmap from the statefile to avoid any disruptions:

Note

This is only required if there are entries that will remain in the aws-auth ConfigMap after migrating. Otherwise, you can skip this step and let Terraform destroy the ConfigMap.

terraform state rm 'module.eks.kubernetes_config_map_v1_data.aws_auth[0]'
terraform state rm 'module.eks.kubernetes_config_map.aws_auth[0]' # include if Terraform created the original configmap

ℹ️ Terraform 1.7+ users

If you are using Terraform v1.7+, you can utilize the remove to facilitate both the removal of the configmap through code. You can create a fork/clone of the provided migration module and add the remove blocks and apply those changes before proceeding. We do not want to force users onto the bleeding edge with this module, so we have not included remove support at this time.

Once the configmap has been removed from the statefile, you can add the new aws-auth sub-module and copy the relevant definitions from the EKS module over to the new aws-auth sub-module definition (see before after diff above). When you apply the changes with the new sub-module, the configmap in the cluster will get updated with the contents provided in the sub-module definition, so please be sure all of the necessary entries are added before applying the changes. In the before/example above - the configmap would remove any entries for roles used by node groups and/or Fargate Profiles, but maintain the custom entries for users and roles passed into the module definition.

authentication_mode = "API"

In order to switch to API only using cluster access entry, you first need to update the authentication_mode on the cluster to API_AND_CONFIG_MAP without modifying the aws-auth configmap. To help make this upgrade process easier, a copy of the changes defined in the v20.0.0 PR have been captured here but with the aws-auth components still provided in the module. This means you get the equivalent of the v20.0.0 module, but it still includes support for the aws-auth configmap. You can follow the provided README on that interim migration module for the order of execution and return here once the authentication_mode has been updated to "API_AND_CONFIG_MAP". Note - EKS automatically adds access entries for the roles used by EKS managed node groups and Fargate profiles; users do not need to do anything additional for these roles.

Once the authentication_mode has been updated, you can update the authentication_mode on the cluster to API and remove the aws-auth configmap components.

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